Reports Unpack Method raised the Debugger mode with error "Wrong Argument types in variable.."

I was updated the AX 2009 RU6 with  RU8 and as the users checked user reports; the error and debugger for unpack method is raised with the following description.


'Wrong Argument types in variable assignment'


This error can also be raised if you are importing any report to the AOT.


To Resolve the error i used following action for particular user.
1. Go to Administrator
2. Open Users form and select the user
3. Select User Options.
4. Select Usage Data
5. Click on the Reset button.

This will reset all the temp data of selection,range etc.